______ worries me that my daughter plays with her cellphone for a long time every day.
The reason ____he was late was ____he had taken a wrong bus.
The 29th Olympic Games ____ in Beijing in 2008.
—Did you visit the museum today?—No. We _____ it, but we spent too much time shopping.
The school is _____ a Chinese teacher for the new term who masters the English language perfectly.
He is always helping people without expecting anything _____.